Machine for beveling mirrors and for analogous purposes.



W. LA HODNYfl .F. X. KIBlTZ. MACHINE FOR BEVEUNG MIRROHSAND FOR ANALOGOUS PURPOSES.

APPLICATION FILED mac. 2. 1916. V 1 ,27,447 Patented A11g. 13, 1918.

2 SHEETS-SHEET V W.RLA HODNY & F. X. KIBITZ. MACHINE FOR BVEL|NG MIRRORS AND FOR ANALOGOUS PURPOSES.

APPLICATION FILiD DEC. 7. I916.

Pa tented Aug. 13, 1918.

2 SHEETS-SHEET 2.

- jazz/ ina f UNITED STATES PATENT ()FFICE.

WILLIAM LA. HODNY AND FRANK x. xxm'rz, or nummrno, msw Yomi, nssxemona STANDARD Mmnon 00., or nurFALo, NEW some Specification 01' Letters latent.

Patented Aug. 13, 1918; ,1

V Application filed December 7, 1916. Serial 1T0. 135,548.-

To all whomdt may concern:

. upplicu-tion for United States Letters Petcut filed by us July 14, 1916, Serial No. 109.284, which urc primarily intended for beveling finishing glass plates used for making mirrors, such machines being, how

1 ever. adapted by adjustment for grinding" and finishing or polishing the edges, the bcv'els and also the surfaces of circular glass plates and other plates or disks.

One object of this invention is to provide i practical and desirable machine of novel construction by means of which glass or otherplatos can be rapidly and accurately beveled and finished. and which is adapted to'hc readily 'u-nd conveniently adjusted and actuated for o crating upon lutes of different sizes and thicknesses and or making bevelspf difi'erent angularity. Other objects of the! invention are to provide a machine of this kind with improved means whereby the plates can be quickly and accurately centered jand secured on the revolving chuck so as to be ground or finished truly concentric with the circular cut edge of the plate, and without danger of injury to the operative in placing thelplatcson und removing them from the chuck; alsoto provide a; centering devicewhich can-he readily set to suit plates of different sizes and which. when set for plutes of one size, is adapted to accurately center the plates on the chuck notwithstanding-"irregularities inthe edges of the plates oii 'uriutions in the'size and thicknesses of the plates; also to provide men-us whereby the'artion of the centering device in centering a. plate on the chuck will not he :iil'cctcd by wear in the chuck spindle or its hearings; also to construct the grinding head by which the plates are hold and rotated in novel munnor so us to ll'ccluully exclude the dust or uhrndiug nniter'iul from the hearings or working parts of the head and thus reduce" the wear thereon.

' In the accompanying drawings Figure 1 is a fragmentary side elcvzitionpartly in section, of a mac ine embodyi the invention, showing'the grinding heed in position for bev'cling a plate,

Fig. 2 is nsimilar view showing the grinding head raised out of operative position and in position for centering the plan; thcreoin i Fig. 3 is' a longitudinal sectional elevih tiond on an. enlarged. scale of the grinding hear Fig. dis a sectional elevation on a sti larger scale of the plate chuck, centering device and associated parts. I

Fig. 5 is an end elevation of the chuck and centering device. I if Fig. 6 is c sectional elevation on line 6-6,'

A represents an abrading wheel or rubbing bed which may be of any usual or suit able kind adapted for performing the grind V ing, finishing or polishing operation, the machine being adapted, depending upon the sort of wheel or .abruding material employed, for performing any of these opcrations. The wheel A shown is mounted to rerolvc horizontally in the usual box or trough B and is adapted to have a; mixture of ahrading material and water poured thereon.

C represents a rotary chuck or holder-on which the plate to be operated upon is held.- and which is driven for revolving the plate while it is held in contact with the ahrnding wheel. The chuck is;prefe'mbly of the vncu- 1 j 1 link or suction type in which theplatc D is gf held in place thereon by exhausting the air i from the chuck, which ismndc hollow for this purpose and is provided on its end face with n yielding gasket 11 against which the plate hours. The chuck is'sccuredprefor- 9 f uhly by adetachable screw threaded ronnection on the lower part of the outer end ofi; hollow spindle 12 which is mounted to revolvc in bearing bushings 13 and 14 screwed, or otherwise suituhl-y secured in the ends of :1 supporting tube. 15. .The chuck spindle shown is also adopted to slide endwise to u limited extent in its hearings for uv urpose hcreinsfter explained. The supporting tube 6 with the abrading wheel.

85 tion pipe 46 gear casing.

ing means.

15 is suitably fixed in a sleeve 16 on an armor support 17 which is pivotally mounted -to swing vertically for carrying the plate D on the chuck into and out of operative contact .20 indicates a, gear casing or housing secured to the upper or inncrend of the supportin tube 15 f r inclosing and protecting the rive gearing for the chuck spindle. The chuck spindle extends through thegeur casing 20 and its upper end projects into and. is adapted to turn in a. stationary suction box or sleeve 21 which is supported as by an arm 22 fixed on the removable cover or end plate 23 of the gear casing 20. A packing gland 24 of any suitable construction in the suction box, surrounds the spindle for. prcventin leakage of air into the suction box. T e suction box may be connected with a suction pump or other means for producing it par tie'l vacuum. in the hollow spindle and chuck, As shown, a flexible suction pipe 25 connects with the suction and prm idcd with a haml-operated valve which adapted 25 to connect the suction box with the suction inc-ans, or with an opening 27 leading to the atmosphere. W hen. the plate 1) is placed 'against the face of the chuck and the valve 26 turned to connect the chuck with the suc- 80 tion means, theplate will be held on the chuck by atmospheric pressure, and by turning the valve '26 to permit the entrance of air through the opening 27, the vacuum is destroyed and the plate released. The sue-- 25 may be a flexible hose or connection of any sort permitting the necessary movements of the grinding head.

he gearing shown for driving the chuck spindle, sec Fig. 3, comprises a worm wheel 28 which is ndapted to revolve freely about 5.5 n sleeve or member 33 keyed on the chuck spindle and lowing tooth or projections at its inner end adapted to engage cooperating teeth or projections on the outer end of the hub of the worm wheel I 34 indicates a clutch-operuiing lever which is provided.

with a forked cud lhnt straddles the clutch member 33 and is fi-llcruuml-ut 35 on the covrr pinto. of the gem casing. The CllllAll lever is connected to the clutch iii-ember 33 conveniently by a loose ring 36 confined in fl'CllClllllfGIBIllliitl groove in the clutch member and connected b trunnions to the fork anus of the lever. iy operatin this lever the chuck spindle is moved on wise in its bearings and the clutch member 33 moved for coupling the chuck spindle to and uncoupling it rom the drive caring. Aspring 37 surrounding the choc spindle within the sup orting tube 15 and hearing at opposite ems against a, shoulder on the spindle and against the spindle bearing 14 tends to move the spindle outwardly and move the clutch member 38 into driving connection with the worm wheel 28. This spring also acts to press the plate D on the chuck yielding against the abrading wheel'when the grinding head is moved to working position, as hereinafter explained. The clutchoperating lever is preferably provided with a bent end adapted to strike a, trip device for mitomet-ically releasing the clutch and stopping the rotation of the chuck when the chuck is swung to move the plate out of contact with the Moulding wheel, as shown in Fig,

By the dcscriiied arrangement of the parts, the chuck spindle is connected at its upper or inner end to the vacuum or suction connections and only one packing gland is necessary and this gland and the suction connection are located at the end of the spindle farthest away from the chuck where dust and the abrading' material are not apt to come into contact with the parts and cause wear therein, which would soon cause an objectionable leak in the vacuum connection. This arrangement also places the vacuum controlling valve and. connections in a more convenient location f operation.

The swinging arm or support 17- for the grinding head preferably has a forked end which straddles u latera rod or support 39 and is journaled on u tubularshaft 40 which is secured transversely in the inner end of the rod 39. through and is adapted to be adjusted hori zontnlly in a sleeve 41 in which it can be fixed by a, set screw or other suitable means and the sleeve 41 is hinged in any suitable manner at 42 to a base or supporting plate 43 which is rigidly secured, us by bolts 44 on the box or trou h B. 45 indicates an adjusting screw wor ing in a threaded lug 0n the supporting or base plate 43 and bearing against an arm or projection 46 on vthe hinged sleeve 41 for adjusting this sleeve to raise and lower the inner end ofthe Intern-l supporting rod 39. The weight of thopar-ts at the inner end of the lateral supporting rod 39 holds the arm or projection 46 of the slcow '41 against the M This lateral rod 39 extends-- lusting screw and causes the mncr end of the supporting rod fut and the grinding head mounted thereon to lower when the adjusting screw 45 is turned in one direction The rod and grinding head.

'al'e raisedhy turning the screw. in the op-2 posite direction. 47 indlcates a stop l-ug'or projection on the swinging arm. l7fadaptedy to strike an adjustable stop rod or dvicej4'8 for limiting the swinging movement of the arm 17 toward the abradinfi wlheel.-hThig;,.

strong an stop rod 48 preferably exten b H is adjustably secured to an ad ust1ng whee 49 which has a screw thread'ed tubular shan screwed into a threaded hole in a partof the hinged sleeve 41. By turning this adjusting wheel 49, the stop rod can beadvanced or re-f tracted to determine the'angular'position' of the grinding head, as may be necessary for av desired bevel on the plate'JDL The adjustable connection of the stop rod 48 and its adjusting wheel -19 permlts the stoprod to be adjusted laterally with the latera sup porting rod 39 when the latter is adjusted-1n j or out so that the stop rod can be set case.- cure the desired angular adjustment of the grinding head in the various lateral adjustments of the supporting rod 39.

50 represents the trip device which is. en-' gagcd by the clutch lever 3 for releasing the clutch and stopping the-rotation of the chuck. This trip device, as shown, consists.

of an arm adjustahly secured, as by'a set screw 51 to the lateral supporting rod 39 and having a lateral projection or stud- 52 which is engaged by the clutch lever. Thetrip device can be adjusted on the supporting rod 39 so as to'cause the release of the clutch when the grinding'head has been swung up to a predetermined position, and

' i the trip device being secured to the supportfrom the chuck by operatingthc clutch lc .60

shaft may be. provided with a ing rod 39 always retains the same relation to the clutch lever irrespective of thelateral adjustments of the supporting rod in the sleeve ell.

The worm 29 of thedrive gearing for the.

chuck spindle can be driven. by any suitable drive connections. As shown, the worm shaft is provided at' ts outer end with a pulley connected by a belt 54 to a pulley 55 on. a shaft 56 which extends through and is" journaled in the tubular pivot shaft 40 for the swinging arm 17 concentrically with the pivotal axis of the swinging arm. This pulley for a c drive belt (not shown) or may driven in any other suitable way. The drive conneetions described pcrn'nt the swinging ar m l'l' carrying the grmdinghcad to bc swim}; to any required angular position relative to the alurading wheel and the worm wheel 28 will be continuously driven in all positions of the chuck and can be coupled to and uncoupled vcr 34.

57 represents a centerin device having pins or parts 58 with whic the plate D is adapted to hecngaged for accurately centeriugthc plate concentrically with the axis of the chuck when securing the plateon the The centerin device is mounted v 1-61 the chuck permit-a relative. movement of one. of, these in such a. way as to parts toward'the other formoving the plate "while hld againstthe face of the chuck into and outof: engagement with the centering.

. contact with the centerin pins or parts, the chuck is adapted to hold t 6 plate m a plane pins orpa'rts 58fof the centering device. In thi's'waymfter the plate has been centered by in front of and out of contact with the centhe'axis of thechuck so that the centering pins. can be secured on the rin at different distances from. the center o diamters. The centering pins shown have the chuck suitable for centering plates oi different reduced screw-threaded. shanks secured b nuts'63 in'the holes 61 and they can be rea ily' secured' inplace and changed from one position to another'on the cc tcring ring.

; ,Whcn the chuck is swung away from the chuck spindle is retracted and its rotation abrading wheel, as shown in Fig; 2, and the stopped by the operationv of the clutch, as

before explained, the center-in pins will project outwardly or forwardy beyond the planeof the holding face oil-the chuck, as shown in Fig.4. If the plateis then placed against the face of the chuck ,and shifted thereon until its circular edge engages'th'c tapering, ends of the centering pinsthe plate will be properly centered with refer cnccto the chuck. In cutting the glass plates D, the edge at that surface ofthe plate. on

which thecutting'tool is used isuSuallv true and substantially smootlrwhile the edge at the opposite Surface-ofitlne plate may.

1'15 of the tapered ends of the centerin pins the more or less irregular or uneven. By reason pinsgcan contact with the true go at one face of the plate without contacting with the other or irregular portions of the edge and the. plate will thus be accurately centered notwithstanding that its edge may be quite irregular or rough in parts. Furthermore,

the plates can be readily centered accurately on the chuck when the ccnterin set for plates of one slze notwithstanding,

*slight variatiolis'which may occllriu thcside device is of the plates, since the chuck can be moved to cause the plate to contact with the taperedportions of thcccntcr pinsncarcr tool far? therirmn their ends. The chuck is held of the plate relative to t from rotation and the suction-producingmeans are disconnected when thus centering? the plate on the chuck and the dplatecan,

therefore be readily mani ulate and bentered on the chuck without 11 r of cutting the hands of the operative. I an the plate has been centered, the valve 26 is operated to connect the chuck with the suction means and cause it to hold the plate, and the grinding head is then swung down to place the late in contact with the abrading wheel.

he movement of the grinding hea toward the abrading wheel moves the clutch-operatr ing lever 34 out of engagement with the trip device and releases the clutch member 83. The spring 37 then moves the chuck outwardly. engaging the, clutch member with the worm wheel and causing rotation of the chuck. Tins action of the sfpring also moves the plate outwardly away rom the pins 58 of the centerin device so that the plate is held clear of t 'e centerinqgins while it is being revolved by the chuc in contact with the abrading wheel and the centering pins therefore cannot interfere with the contact of the edge of the plate with the abradifig wheel or obstruct the angular adjustment a wheel. Mani festly, the chuck and centering device could be related in various other ways, which would permit one of the parts to move rela tively to the other to enab e the plate to contact with the centering pins for centering it and tothen be held by the chuck in a position iii-front of and out of contact with the pins. I

The spring 37 holds the plate D against the abrnd-ing wheel with sufficient pressureto insure the proper abrading action, but

thc contact is a yielding one which prevents injury to the plate in case it is not of uniform thickness throughout or has an irregular edge. The teeth of the'clutch are long enougli to allow of such yielding of the chuck without discngagement of the teeth.

65,Fig. 4 represents a centering collar-secured on the cliuckspindle 12 and having a. tapered or frnsto-cmiical socket and, (i6 is "a correspondingly tapei'cdor coned end on the bearingrbushing 13 min ptcd to cuter and fit-said'sockct. Qas shpwn in Fig. 4, when the chuck is moved toward the centering device 57 for centering the plate I). These interfittin}, parts hold the chuck accurately con- 'ccntrio-fwitli the centering device 57 while the plate D is being cluttered on the clutch and thus insuring the accurate centering of the plate on the. chuck,- notwithstanding any wear onloosoncssin the bearing oft-he chuck spindle which might allow the chuck to assume apposition not concentricwitihthel centering device. Any other sui-tal'ile interlitling! or m'iiipm'almg parts connected with the chuck andn'lth tho centering device and plate on chuck, said chuck and centering evice being a team I actin' i this mannercould be employ forlt is urpose, I 67 indicates a guard sleeve extendin f wardly fro nthe tub of the centering 3" between the concentric sleeveilv 8 extehdgl rearwardl from the chemo- Theseyt scopings eeves form a or '3 around. the outerbearin 8 spindle and protect this bea and abradi'ng material, thucg i'eatly i i. ingIthe life ofthe bearing. I

0 claims are mad hereinio'r the cen. ing device in combinationwith the mean for stoppir therotationofthe chutikQWlib centerin t e late on the chuck, the being 0, aime in said applicatio liivfl by" mentioned. Neither are claims made li'erein v for the meat for sap )(tltlllg and adjusting. the grinding i.. i=ad, t e same forming the subject matter of another application.

We claim as our invention 1. The combination with an abradinlg wheel for a plate, of a rotary chuck for holing the fate, and a device for centerin the plate e the chuck having parts with w ioh the; edge of a plate held a aiust the chiick is adapted to be enga- .d or centering! the plate on the chuck, sai chuck and centering device being relatively movable for "engaging the plate with and holding it away from i' 195, centering parts. I 2. The combination with, an, abradin wheel for a plate, ofa rota chuck to; ho if ing the plate, and a device or centering the the chuck having beveled membersagainst which the edge ofa-plat'e' held against the chuck is adapted to'he engagged for centering the plate on the chuck, said chuck and centering device being relatively movable for en aging the plate with and holding it away 530!!! said beveled centering 1nembers, said chuck and centering device having a variable relative move-- Y mcnt whereby the late can be engaged withdill'orcnt parts 0t said beveled centering mcmbers for centering plates which vary in diameter. i a

3..The combination with an' abrading wheel for a. plate, of a rotary chuck for holding the plate, and a device for centering the plate on the chuclr having beveled centering members located outwardly beyond the :eriphcry otthc chuck against which the e, ge of,a plate held against the chuck is adapted to be engaged for centering the late on the relatively movable for on aging the plate with and holding it away rom said beveled centering"mombcrs.

4. -The combination with an abrading wheel for a plate, of a rotary chuck for holding. the plate. and a device for centering the 7 plate on the chuck having parts with which.

the edge of-a. plate held against the chuck is adapted to be engaged for centering the plate on the chuck, said chuck being movthe plate with and holding it away 'I'Oll'l said )arts of the centering device.

6. he combination with an abrading wheel for a plate, of a rotary chuck for holding the plate, and a centering device comprising an annular support provided with holes located at different distances from the axis of the chuck, and centering pins adapted to be secured in said holes at ditl'ercnt distances from the axis of the chuck, said chuck and centering device being relatively niovablefor engaging the plate with said centering pins to center the plate on the chuck and for holding the plate away from the centering pins. i

7. The combination with an abrading wheel for a plate, of a, rotary chuck for holding 'the'plate, a device having parts with which the edge ofa plate held against. the chuck is adapted to be engagcd for centering the plate on the chuck, said chuck and centering device being relatively mov able for engaging the plate with and holding it. away from said centering parts, and

coinwrating parts on said chuck and on said centering device which engage to hold the chuck (:(mcentrie with the centering device while centering the plate on the chuck.

S. The (annhinalion of an abrading wheel for a plate, ot-a rotary chuck for holding the plate, a device for centeringthe plate on the chuck having parts with which the edge of the plate held against the chuck is adapted to be engaged for centering the plate onthe chuck. said chuck and centering device being relatively movable .l'o'r cngaging the plate with and holding it away from said centering parts, a socket connected with said chuck. and a member connected with said centerin device and adapted toenter said socket when the chuck and centerin device are moved relatively toward each other for holding said chuck concentric with said centering device.

9. The combination with an abrading wheel for a plate, a rotary chuck fo'r'hold: ing the plate, and a- 'centering device with which the edge of a plate held againstthe chuck is adapted to be engaged for centering the plate on the chuck, said chuck and centering deviecbcing relatively movable for engaging the plate withsaid centering device, a bearing for the chuck, and telescoping sleeves connected to said chuck and centering device and surrounding said bearing for protecting the same from dust.

10. The combinati m with an abrading wheel fora plate, of a rotary chuck for holding the plate, a device for centering said plate on said chuck, a support on which said chuck is journaled and which is movable toward and from the abrading wheel for moving the plate into and out of contact with the wheel. said chuckbeing vieldingly mounted on said support, and a spring which presses said chuck out of operative relation to said centering device and toward saidabradmg wheel for holdlngthe plate yields ingl v against the abrading wheel.

ll. The combination with an abrading wheel for a plate, of a' rotary chuck for holding the plate, a spindle for said (hack, a tube in which said spindle is journaled and which is freely movable for moving the plate into and out of contact with the abrading whechsaid chuekjspindl'e being movable endwise' in said supporting tube, -and a spring Ill said supporting tube which presses the chuck toward the abrading wheel for holding the plate yicldingly against the abrading wheel.

'it [less our hands this id day of Decemlltl'. ltllt i.

WILLIAM. LA no'oa'i, l lL-MNJC X. KIBITZ. 

